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IC418 (Planetary nebula) is the only nebula i can recall seeing a different colour, it appeared as a small red ring around the central star. for the details:
a - 25 years old
b - 30" telescope, 13mm eyepiece (I believe it gave about 260x mag)
c - Seeing was average (5-6/10), I don't recall the transparency that night.
The nebula itself didn't show much detail though the colour was fairly obvious to multiple observers.
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